Question

def group_display(request, group_id):
    groups = Groups.objects.get(id=group_id)
    username = UserInfo.objects.get(owner = request.user)
    form = membership_form()
    template = 'groups.html'


    if request.method == 'POST':
        form = membership_form(request.POST)
        if form.is_valid():
            post = form.save(commit=False)
            post.name = username
            post.group = groups
            post.save()

    context = {
               'form':form,
               }
    return render(request, template, context)

问题在于，每次重新加载页面时，都会向成员资格模型添加新行。好像页面加载为request.POST。有什么办法可以只在按钮点击时插入数据吗？

Answer 1

成功发出POST请求后，最好返回重定向。这可以防止在刷新页面时再次处理发布请求。如果需要，您可以重定向到当前网址。

from django.shortcuts import redirect

def group_display(request, group_id):
    ...
    if request.method == 'POST':
        form = membership_form(request.POST)
        if form.is_valid():
            post = form.save(commit=False)
            post.name = username
            post.group = groups
            post.save()
            return redirect('/success-url/')
    ...

Answer 2

您可以做两件事：

成功发布后重定向。
检查以确保该用户没有注册。

这是一个照顾两者的视图：

from django.shortcuts import get_object_or_404, redirect

def group_display(request, group_id):
    groups = get_object_or_404(Groups, id=group_id)
    username = get_object_or_404(UserInfo, owner=request.user)

    if username.membership_set.exists():
       # This user is already enrolled
       return redirect('/')

    form = membership_form(request.POST or {})
    template = 'groups.html'
    context = {'form': form}

    if form.is_valid():
        post = form.save(commit=False)
        post.name = username
        post.group = groups
        post.save()

        return redirect('/')

    return render(request, template, context)

您必须根据自己的型号调整username.membership_set.exists。

Django数据库正在更新每个页面加载

2 个答案: